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  • Brookhaven physicist Tonica Valla in the OASIS laboratory at Brookhaven National Laboratory.
    Brookhaven National Laboratory
    Brookhaven physicist Tonica Valla in the OASIS laboratory at Brookhaven National Laboratory.
  • Brookhaven physicist Ilya Drozdov, lead author on a new paper mapping out a previously unexplored region of the phase diagram of a common superconductor.
    Brookhaven physicist Ilya Drozdov, lead author on a new paper mapping out a previously unexplored region of the phase diagram of a common superconductor.
  • This phase diagram for BSCCO plots the temperature (T, in degrees Kelvin, on the y axis) at which superconductivity sets in as more and more charge vacancies, or
    This phase diagram for BSCCO plots the temperature (T, in degrees Kelvin, on the y axis) at which superconductivity sets in as more and more charge vacancies, or "holes," are doped into the material (horizontal, x axis). On the underdoped side of the "dome" (left), as more holes are added, the transition temperate increases to a maximum of 94 K, but as more holes are added, the transition temperature drops off. The red dashed line represents previously assumed dependence of superconductivity "dome," while the black line represents the correct dependence, obtained from the new data (black dots). This was the first time scientists were able to create highly overdoped samples, allowing them to explore the part of the phase diagram shaded in yellow where superconductivity disappears. Tracking the disappearance may help them understand what causes superconductivity to occur in the first place.
  • The Fermi surface, or the highest occupied state in the electronic structure, allows direct determination of the doping level. This picture shows the Fermi surface of the highly overdoped, non-superconducting BSCCO where the holes were added into the material by exposure to ozone.
    The Fermi surface, or the highest occupied state in the electronic structure, allows direct determination of the doping level. This picture shows the Fermi surface of the highly overdoped, non-superconducting BSCCO where the holes were added into the material by exposure to ozone.
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